Stock for spirit levels



June 1,1926. 1,587,258

- A P. H. VOGEL STOCK FOR SPIRIT LEVELS Filed Oct. lO. 1923 d] l 1 I6 ln' n "if /5 o l l llV o l I1 l l1 Z lo l5 Inv-antan' Patented June "l,1926.

UNITED STATES PAUL H. VOGEL, `OF NEW BRITAIN, CONNECTICUT.

STOCK FOR SPIRIT LEVELS,

Application led October My invention relates to improvements in stocksfor spirit levels of the form that 1s shown and described in the patentissued under date of May 13, 1919,- No. 1,303,829,

I to Gustave A. Vogel, having I-beam form for the cross-section, withtop and bottom bars or flanges of aluminum and having the web portion ofdifferent metal, and the object of my improvement is to produce a stockthat has for the web structure a piece of brass or copper, whereby Ilind that certain improved results are attained, particularly in thedetail of manufacture.

In the accompanying drawing z- Figure 1 is a side elevation of myimproved stock as incorporated in a complete level structure.

Figure 2 is a side elevation on an enlarged scale of part of thestructure that is shown 20 in Fig. 1, and in part broken away along oneof the bars or flanges.

Figure 3 is an end elevation of the same.

Figure 4 is a sectional view on the line 4-4 of Fig. 2. l

In the structure shown in the drawing the stock is provided with anopening 11 at the `middle and with an opening 12 adjacent each end forthe indicating glasses, comprising the level glass 13 at the middle andthe plumb glasses 14 at the ends.

Said stock 10 comprises the web 15 in the form of an elongated sheetmetal plate that is bordered along the top and bottom edges by the barsor flanges 16, the structure as a whole having in cross-section thegeneral form of an I-beam.

As a detail, along the border portions 17 of the web l on each edgeportion is a series of openings 18 that are covered by the bars orflanges 16 and serve to hold the parts together by reason of metal fromthe bars or flanges 16 entering therein during the casting thereof.

The bars or flanges 16 are made of alumi l0, 1923. Serial No. 667,638.

While brass is mentioned and is preferred,

it is understood that copper' could be used with corresponding goodresults from a util` C structure 19 is obtained directly and withoutspecial finishing, whereas with a plate of steel such finishing,involving the trimming oil' of a lin, is a common requisite forproducing a satisfactory product. The superior result mentioned isobtained by the use of the same'molds and a brass plate of the same sizeand thickness as the plate of steel in the previous form of structure.

Also, the details of the casting operation are materially simpler in theuse of the brass plate over those involved in the use of the plate ofsteel.

Thus, with steel chills are necessary in casting to prevent damage tothe flanges by breakage at the points adjacent the glasses.k

lllithout the chills a break will occur across the flange, due to theeffects of expansion and shrinkage that occur because of the differencesin temperature and changes in tem,- perature of the parts.

With a web made of brass, or copper, or copper-alloy no such damages tothe flanges occur and with no chills used in casting.

I claim as myA invention s A stock for a level having an I-beam form ofcross-section, comprising a web in the form of a piece of sheet metaland llangestructures extending along the opposite border edges of saidweb and being made of cast aluminum, anchorage means being provided Y inthe form of p'erforations distributed along said edges and filled withcast material integral with said flange-structures, said web having aset of openings for indicating glasses, and the material for said webbeing brass.

PAUL H. VOGEL.

